Autodesk Inventor has its library stored as a *.asklib file. To create additional materials i.e. Aluminium 6056, you would need to manually do this within inventor.
You can export the asklib file as an xml, import the materials, save and then import the xml file.
I would like this automated and to create 1000's of materials in this xml file. Materials are available from matweb.com for $100 per year.
It would be nice if it was a setup file that ran and updated the material library.